Garudapurana 1.48.82

1.48.82

jyeṣṭhasāma ca bhāruṇḍaṃ tannayāmīti paścime /
nīlarudro mahāmantraḥ kumbhasūktamatharvaṇaḥ //

and the Jyeṣṭhasāman, the Bhāruṇḍa, and "tannayāmi..." in the west; / the great Nīlarudra mantra and the Atharva Kumbhasūkta [in the north];